Need advise on antenna amplification issue on DT

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Since the 7777 is a fixed gain amplifier, you basically have two
(reasonable) choices to try:
1) Add an attenuator just ahead of your ATSC receiver. These are
available in 3, 6, and 12dB "sizes" from parts-express.com and other places
for less than $2. I'd try the 3dB first.
2) Try rotating your antenna slightly. Multipath might be the issue, as
the receiver may be trying to lock on a strong, amplified, reflection.

If neither of these works, you might need a different antenna. What are
you using now? Are you using the antenna for analog as well as digital?
Do you have any VHF digitals?

Brad


Brad Krehbiel, PE
Crown Center Redevelopment Corp.
Phone: 816-274-8564
Fax: 816-274-4567



Robert Wade Brown
<[email protected] To: "HDTV Magazine" <[email protected]>
om> cc: (bcc: Brad J Krehbiel/KC/HALLMARK)
Sent by: "HDTV Subject: Need advise on antenna amplification issue on DT
Magazine"
<hdtvmagazine_tips@ilo
vehdtv.com>


07/27/2005 10:16 AM
Please respond to
"HDTV Magazine"






----- HDTV Magazine Tips List -----

7/27/2005 9:58am ct

I receive my over-the-air network broadcasts from 65 miles
south of
my rooftop antenna, so I use an amplifier for the analog channels
(Channel Master "Titan" model 7777, VHF/UHF/FM
http://www.channelmaster.com/home.htm ).

When the Fox channel, KMSS DT-34, was doing testing a month or
so
ago from its new, full power (1,000,000 watts) antenna, at a lower
power, I got DT-34 crystal clear. However, now that they are at full
power, I can't get it at all... although I continue to get al the
other channels from the same mountaintop (DT-28 is also 1,000,000
watts and comes in loud and clear).

The engineer at Fox-34 tells me it is my analog amplifier
causing
the problem. He says the amplifier is overwhelmed by the signal
power of an "upper channel" (defined as above channel 30) and does
not properly amplify the data within the channel's carrier. I should
get rabbit ears or play with it by removing the amplifier or
installing special filters. ($$$$$)

Comments please !

Also, does anyone know if there is an amplifier that is
designed to
support VHF/UHF/FM using TV and DT signals that solves this problem
if, indeed, the problem is as the engineer outlines?

Best,
Robert
903-792-2020





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One easy solution, and there are others: if you have 2 antenna inputs, use
the outside antenna for most and the "rabbit ears" for the overloaded
station.



-----Original Message-----
From: Robert Wade Brown
Sent: Wednesday, July 27, 2005 11:16 AM
To: HDTV Magazine
Subject: Need advise on antenna amplification issue on DT

----- HDTV Magazine Tips List -----

7/27/2005 9:58am ct

I receive my over-the-air network broadcasts from 65 miles south of
my rooftop antenna, so I use an amplifier for the analog channels
(Channel Master "Titan" model 7777, VHF/UHF/FM
http://www.channelmaster.com/home.htm ).

When the Fox channel, KMSS DT-34, was doing testing a month or so
ago from its new, full power (1,000,000 watts) antenna, at a lower
power, I got DT-34 crystal clear. However, now that they are at full
power, I can't get it at all... although I continue to get al the
other channels from the same mountaintop (DT-28 is also 1,000,000
watts and comes in loud and clear).

The engineer at Fox-34 tells me it is my analog amplifier causing
the problem. He says the amplifier is overwhelmed by the signal
power of an "upper channel" (defined as above channel 30) and does
not properly amplify the data within the channel's carrier. I should
get rabbit ears or play with it by removing the amplifier or
installing special filters. ($$$$$)

Comments please !

Also, does anyone know if there is an amplifier that is designed to
support VHF/UHF/FM using TV and DT signals that solves this problem
if, indeed, the problem is as the engineer outlines?

Best,
Robert
903-792-2020





To unsubscribe please click: [email protected]

To receive the digest mode (one email a day made from all posted that same
day) send an email to:
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----- HDTV Magazine Tips List -----

These are good to try. Rotating slightly, especially if it is high gain,
will attenuate the signal some. It can also attenuate the weaker stations if
they are in the same direction, just as using an in line attenuator. This is
just something you will have to try, but rotating is a good start.

Channel Plus made an amplifier with adjustable gain, and I am sure there are
others. It's a pain to readjust every time you switch stations, but it can
work.

Another way is to get a block for that channel and use it on the outside
antenna, and use a smaller antenna into a combiner for the overload station.
That way there is no switching antenna inputs on the TV. However, it could
cause other problems so you will need to try it before permanently
installing.



-----Original Message-----
From: Brad J Krehbiel
Sent: Wednesday, July 27, 2005 12:30 PM
To: HDTV Magazine
Subject: Re: Need advise on antenna amplification issue on DT

----- HDTV Magazine Tips List -----


Since the 7777 is a fixed gain amplifier, you basically have two
(reasonable) choices to try:
1) Add an attenuator just ahead of your ATSC receiver. These are
available in 3, 6, and 12dB "sizes" from parts-express.com and other places
for less than $2. I'd try the 3dB first.
2) Try rotating your antenna slightly. Multipath might be the issue, as
the receiver may be trying to lock on a strong, amplified, reflection.

If neither of these works, you might need a different antenna. What are
you using now? Are you using the antenna for analog as well as digital?
Do you have any VHF digitals?

Brad


Brad Krehbiel, PE
Crown Center Redevelopment Corp.
Phone: 816-274-8564
Fax: 816-274-4567




Robert Wade Brown

<[email protected] To: "HDTV
Magazine" <[email protected]>
om> cc: (bcc: Brad J
Krehbiel/KC/HALLMARK)
Sent by: "HDTV Subject: Need advise on
antenna amplification issue on DT
Magazine"

<hdtvmagazine_tips@ilo

vehdtv.com>





07/27/2005 10:16 AM

Please respond to

"HDTV Magazine"









----- HDTV Magazine Tips List -----

7/27/2005 9:58am ct

I receive my over-the-air network broadcasts from 65 miles
south of
my rooftop antenna, so I use an amplifier for the analog channels
(Channel Master "Titan" model 7777, VHF/UHF/FM
http://www.channelmaster.com/home.htm ).

When the Fox channel, KMSS DT-34, was doing testing a month or
so
ago from its new, full power (1,000,000 watts) antenna, at a lower
power, I got DT-34 crystal clear. However, now that they are at full
power, I can't get it at all... although I continue to get al the
other channels from the same mountaintop (DT-28 is also 1,000,000
watts and comes in loud and clear).

The engineer at Fox-34 tells me it is my analog amplifier
causing
the problem. He says the amplifier is overwhelmed by the signal
power of an "upper channel" (defined as above channel 30) and does
not properly amplify the data within the channel's carrier. I should
get rabbit ears or play with it by removing the amplifier or
installing special filters. ($$$$$)

Comments please !

Also, does anyone know if there is an amplifier that is
designed to
support VHF/UHF/FM using TV and DT signals that solves this problem
if, indeed, the problem is as the engineer outlines?

Best,
Robert
903-792-2020





To unsubscribe please click: [email protected]

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day) send an email to:
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day) send an email to:
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Robert,

First, if a signal is overloading a UHF amplifier, it affects all UHF
channels, not just some channels.

Second, assuming you are somewhere near Fulton, Arkansas (71838), there
isn't a TV transmitter in your area that could possibly overload a 7777
amplifier.

What the station "engineer" told you is total bunk. (He might have
"engineer" in his job title but I think it unlikely that he has an
engineering degree.) His advice should be totally disregarded.

My guess is that the station is having technical difficulties that it
doesn't want to admit to. Probably the station is not on the air. A
PSIP problem is another possibility. According to the FCC web site,
KMSS is not presently licensed for 1,000,000 watts. Perhaps you should
wait until things at the station settle down.

Ken Nist, MSEE (ret), KQ6QV


-----Original Message-----
From: Robert Wade Brown <[email protected]>
To: HDTV Magazine <[email protected]>
Sent: Wed, 27 Jul 2005 10:16:05 -0500
Subject: Need advise on antenna amplification issue on DT

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